Initial Contribution
This commit is contained in:
The Android Open Source Project
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.codelab.rssexample;
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import android.content.ContentProvider;
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import android.content.ContentProviderDatabaseHelper;
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import android.content.UriMatcher;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.SQLException;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteQueryBuilder;
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import android.net.Uri;
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import android.content.ContentValues;
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import android.text.TextUtils;
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import java.util.logging.Logger;
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// Content Provider for RSS feed information. Each row describes a single
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// RSS feed. See the public static constants at the end of this class
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// to learn what each record contains.
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public class RssContentProvider extends ContentProvider {
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private Logger mLogger = Logger.getLogger("com.example.codelab.rssexample");
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private SQLiteDatabase mDb;
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private DatabaseHelper mDbHelper = new DatabaseHelper();
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private static final String DATABASE_NAME = "rssitems.db";
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private static final String DATABASE_TABLE_NAME = "rssItems";
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private static final int DB_VERSION = 1;
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private static final int ALL_MESSAGES = 1;
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private static final int SPECIFIC_MESSAGE = 2;
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// Set up our URL matchers to help us determine what an
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// incoming URI parameter is.
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private static final UriMatcher URI_MATCHER;
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static{
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URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
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URI_MATCHER.addURI("my_rss_item", "rssitem", ALL_MESSAGES);
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URI_MATCHER.addURI("my_rss_item", "rssitem/#", SPECIFIC_MESSAGE);
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}
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// Here's the public URI used to query for RSS items.
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public static final Uri CONTENT_URI = Uri.parse( "content://my_rss_item/rssitem");
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// Here are our column name constants, used to query for field values.
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public static final String ID = "_id";
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public static final String URL = "url";
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public static final String TITLE = "title";
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public static final String HAS_BEEN_READ = "hasbeenread";
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public static final String CONTENT = "rawcontent";
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public static final String LAST_UPDATED = "lastupdated";
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public static final String DEFAULT_SORT_ORDER = TITLE + " DESC";
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// Database creation/version management helper.
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// Create it statically because we don't need to have customized instances.
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private static class DatabaseHelper extends ContentProviderDatabaseHelper{
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@Override
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public void onCreate(SQLiteDatabase db){
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try{
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String sql = "CREATE TABLE " + DATABASE_TABLE_NAME + "(" +
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ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
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URL + " TEXT," +
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TITLE + " TEXT," +
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HAS_BEEN_READ + " BOOLEAN DEFAULT 0," +
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CONTENT + " TEXT," +
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LAST_UPDATED + " INTEGER DEFAULT 0);";
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Logger.getLogger("com.example.codelab.rssexample").info("DatabaseHelper.onCreate(): SQL statement: " + sql);
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db.execSQL(sql);
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Logger.getLogger("com.example.codelab.rssexample").info("DatabaseHelper.onCreate(): Created a database");
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} catch (SQLException e) {
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Logger.getLogger("com.example.codelab.rssexample").warning("DatabaseHelper.onCreate(): Couldn't create a database!");
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}
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
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// Don't have any upgrades yet, so if this gets called for some reason we'll
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// just drop the existing table, and recreate the database with the
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// standard method.
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db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE_NAME + ";");
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}
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}
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@Override
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public boolean onCreate() {
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// First we need to open the database. If this is our first time,
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// the attempt to retrieve a database will throw
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// FileNotFoundException, and we will then create the database.
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final Context con = getContext();
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try{
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mDb = mDbHelper.openDatabase(getContext(), DATABASE_NAME, null, DB_VERSION);
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mLogger.info("RssContentProvider.onCreate(): Opened a database");
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} catch (Exception ex) {
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return false;
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}
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if(mDb == null){
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return false;
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} else {
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return true;
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}
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}
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// Convert the URI into a custom MIME type.
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// Our UriMatcher will parse the URI to decide whether the
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// URI is for a single item or a list.
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@Override
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public String getType(Uri uri) {
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switch (URI_MATCHER.match(uri)){
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case ALL_MESSAGES:
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return "vnd.android.cursor.dir/rssitem"; // List of items.
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case SPECIFIC_MESSAGE:
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return "vnd.android.cursor.item/rssitem"; // Specific item.
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default:
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return null;
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}
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}
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@Override
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public Cursor query(Uri uri, String[] projection, String selection,
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String[] selectionArgs, String groupBy, String having, String sortOrder) {
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// We won't bother checking the validity of params here, but you should!
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// SQLiteQueryBuilder is the helper class that creates the
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// proper SQL syntax for us.
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SQLiteQueryBuilder qBuilder = new SQLiteQueryBuilder();
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// Set the table we're querying.
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qBuilder.setTables(DATABASE_TABLE_NAME);
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// If the query ends in a specific record number, we're
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// being asked for a specific record, so set the
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// WHERE clause in our query.
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if((URI_MATCHER.match(uri)) == SPECIFIC_MESSAGE){
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qBuilder.appendWhere("_id=" + uri.getPathLeafId());
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}
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// Set sort order. If none specified, use default.
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if(TextUtils.isEmpty(sortOrder)){
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sortOrder = DEFAULT_SORT_ORDER;
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}
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// Make the query.
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Cursor c = qBuilder.query(mDb,
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projection,
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selection,
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selectionArgs,
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groupBy,
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having,
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sortOrder);
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c.setNotificationUri(getContext().getContentResolver(), uri);
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return c;
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}
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@Override
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public int update(Uri uri, ContentValues values, String whereClause) {
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// NOTE Argument checking code omitted. Check your parameters!
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int updateCount = mDb.update(DATABASE_TABLE_NAME, values, whereClause);
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// Notify any listeners and return the updated row count.
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getContext().getContentResolver().notifyUpdate(uri, null);
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return updateCount;
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}
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@Override
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public Uri insert(Uri requestUri, ContentValues initialValues) {
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// NOTE Argument checking code omitted. Check your parameters! Check that
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// your row addition request succeeded!
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long rowId = -1;
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rowId = mDb.insert(DATABASE_TABLE_NAME, "rawcontent", initialValues);
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Uri newUri = CONTENT_URI.addId(rowId);
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// Notify any listeners and return the URI of the new row.
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getContext().getContentResolver().notifyInsert(CONTENT_URI, null);
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return newUri;
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}
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@Override
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public int delete(Uri uri, String where) {
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// NOTE Argument checking code omitted. Check your parameters!
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int rowCount = mDb.delete(DATABASE_TABLE_NAME, ID + " = " + uri.getPathLeafId());
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// Notify any listeners and return the deleted row count.
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getContext().getContentResolver().notifyDelete(uri, null);
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return rowCount;
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}
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}
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